Apparatus for making bags of paper or like on a bottom making cylinder



A. FINKE APPARATUS FOR MAKING BAGS OF PAPER 0R LIKE Feb. 12, 1963 3,077,147 ON A BOTTOM MAKING CYLINDER 4 Sheets-Sheet 1 Filed May 5, 1959 all?- Aiii A Feb. 12, 1963 Filed May 5, 1959 A. FINKE APPARATUS FOR MAKING BAGS OF PAPER OR LIKE ON A BOTTOMMAKING CYLINDER 4 Sheets-Sheet 2 l8 Fig.3

Fig. 8

Feb. 12, 1963 A. FlNKE 3,077,147

APPARATUS FOR MAKING A S OF PA R 0R LIKE ON A BOTTOM M NG CYLIN Filed May 5, 1959 4 Sheets-Sheet 3 Fig. 10

Feb. 12, 1963 A. FINKE 3,077,147

APPARATUS FOR MAKING BAGS OF PAPER 0R LIKE ON A BOTTOM MAKING CYLINDER Filed May 5, 1959 4 Sheets-Sheet 4 F/ig. II

3,677,147 APPARATUS FOR MAKENG BAGS OF PAPER R LIKE ()N A BOTTOM MAKING CYLINDER Arno Finite, Lengerich, Westphalia, Germany, assignor to Windmiiller dz Hiilscher, Lengerich, Westphalia, Germany Filed May 5, 1959, Ser. No. 811,154 Claims priority, application Germany May 9, 1958 15 Claims. (Cl. 93-23) It is known to make bags of paper or like on a bottom making cylinder by having a tube section rotate in longitudinal direction together with the cylinder and providing it with the bottom at the advancing end. To hold the bag at the cylinder, grabs and clamps are provided which seize the Work at its front part and rotate along with the bottom making cylinder. Opposite the periphery of the bottom making cylinder there are stationary working stations, i.e., devices not rotating along with the cylinder which perform the processes required for making the bottom on the workpiece passing along with the cylinder. in the known art one of these stationary stations is used to fold up the trailing bottom side cover at the bottom in the direction of travel. The known systems have considerable disadvantages because they either limit the operating speed of the machine or result in other troubles, such as smearing with paste.

To overcome these drawbacks the object of the invention is to provide the folding tools for the trailing bottom cover not in the form of a stationary station in relation to the bottom making cylinder, but to mount them on the revolving cylinder, causing them to rotate along with that cylinder. To carry out the present invention the folding tool is designed to form two fingers engaging from the side of the cylinder to make a component of the grasping devices of the bottom making cylinder. There being a number of duplicates of the tools mounted in spaced relation about the periphery of the cylinder, i.e., each grasping device in the cylinder will be fitted with such fingers. These fingers need to operate only at a comparatively low speed because they need not be returned to their initial working position before a full circulation of the bottom making cylinder. Neither will it be possible for them to come in contact with the paste used for sealing the bottom. As, according to the invention, the folding tool travels along with the bag and may rest on the first folded, trailing side cover until the other side cover is folded on top thereof, additional tools holding down the side cover will not be required.

According to the invention the fingers of the folding device will be provided with a control such that they also serve to efiect the preliminary fold which is necessary on these machines in order that, when opening the leading tube end to form the bottom square, the folding of the upper tube wall that must be folded back will be performed satisfactorily and be positioned exactly in the center of the bottom to be made.

Hitherto said preliminary fold has been made by a special device before the tube sections are passed to the bottom making cylinder. Here also the lower tube well could not be prevented from being distorted when the preliminary fold is made although the latter is only needed in the upper tube wall. The result is that in bags made by known machines the lower tube wall including the adjacent portions of the side folds are weakened in an undesired manner, and the good appearance of the finished bag is impaired. The sube wall situated against the cylinder when making the bag forms front of the finished bag, to show over its whole surface the advertising with which this side of the bag is usually furnished.

The present invention therefore provides that the control of the fingers entering from each side of the cylinder 3,077,147 Patented Feb. 12, 1953 transversely to the tube axis is effected in such a way that prior to forming the bottom the fingers .will be placed on the tube section rotating along with the bottom making cylinder at the line where the upper tube wall will be folded back when forming the bottom square. Thereby they clearly define the fold along this line when forming the bottom square, thus the conventional preliminary fold may be omitted. After this procedure the fingers, as referred to above, will be controlled in such a way as to fold the bottom side cover when the machine advances without the fold for the trailing bottom side cover being prefolded as has been indispensable in the heretofore known machines, further weakening and disfiguring the bag body lying below on both sides of the bag and the lateral folds.

The fingers of the present device are provided in addition to the conventional lateral rabs instead of the fixed stations. Thus, there are a total of four tools for each operating station on the bottom making cylinder. If, for example, a cylinder having five operating stations is used, then four times five, or twenty tools are mounted on the cylinder. All of these tools have to be readjusted when changing the width of bag. To avoid this time-consuming separate readjustment the invention further provides that all of the lateral tools are arranged on carriers, one on each side of the bottom making cylinder, the carriers being separate from the cylinder, but rotating along with the latter and being adjustable in the axial direction of the cylinder, thus all of the tools can be adjusted commonly and simultaneously to fit various widths of bags to be made.

The invention will be explained in the accompanying drawings in which:

FIG. 1 is a diagrammatic side view showing the bottom making cylinder with the surrounding working stations and rotating tools;

FIGS. 2 to 7 show the mode of operation of the apparatus according to FIG. 1, showing plans of the bag in the stages of its manufacture when turning down the trailing side wrapper;

FIG. 8 is a side view showing a finished bag with side folds;

FIG. 9 is a view showing a tube section being in the bottom opening station, as it would appear when looking in the direction of arrow A in FIG. 1;

PEG. 10 is a side view showing a bottom making cylinder with the carriers receiving the lateral tools as per section taken on the line A-B in FIG. 11, the exterior rim of the cam disk being broken off;

FIG. 11 is a partly broken away section taken through the bottom making cylinder as shown in FIG. 10, the working cylinder proper not being intersected, the %ntral grabs and the parts controlling the folding clamps being omitted, and other parts being shown broken away to improve the clearness;

FIG. 12 is a fragmentary view in the direction of arrow B in FIG. 11 showing a cut of the bottom making cylinder with a lateral grab according to the invention.

The lateral fold tube sections coming from a cutting device (not shown) will be fed in the plane 1 (shownin FIG. 5) indicated by a dash-dotted line, engaged by segmental disks 2 and roll 3 in the known manner, and led to tr e bottom making cylinder via a by-pass 4 co-acting with feed rollers 5, the bottom making cylinder having four working or operating stations in this instance. The upper tube wall will be grasped by one of the suckers 7 and lifted while passing along, thus one of the four central grabs 8 arranged at the bottom making cylinder 6 will be permitted to engage the tube section at the front of the lower tube wall adjoining the cylinder. At the same time, in a well-known manner, a pair of lateral grabs 9 shift between the side folds of the workpiece opened by the suckers, which grabs 9 are placed on the lower side of the side folds at that point where the leading side wrapper formed in due course will be turned down later.

The invention provides that each operating station referred to above is also equipped with a pair of lateral fingers 18 which first shall be described in the form used to turn down the trailing side wrapper.

As shown in PEG. 1 for each of four identical operating stations of the bottom making cylinder 6, such lateral fingers 18 are held at their ends extending sideways beyond the front of the bottom making cylinder by an arm 41 of a two-armed lever 41, 42, which is pivoted about the axis 43 situated in parallel to the axis of the bottom making cylinder. The end of the other arm 42 of said lever slides under the action of a spring (not shown) along a cam disk 44, the sliding surface of which is parallel to the axis of the bottom making cylinder, thus alterations in the cam disk will result in a lifting and lowering of the finger 18 in a radial direction to the bottom making cylinder 6.

The pivot 43 of lever 41, 42, is at the end point of arm 45 of a second two-armed lever 45, 46, which is pivoted about an axis 47 situated parallel to the axis of the bottom making cylinder. The end of the other arm 46 of said second lever slides, under the action of a spring (not shown) along a cam disk 48, the sliding surface of which is parallel to the axis of the bottom making cylinder, thus curvatures of said cam disk 43 will result in a reciprocating movement of pivot 43 of the first lever arm 41, 42, and of the finger 18 in the peripheral direction of the bottom making cylinder 6.

In its pivot 47 the lever 45, 46, is fixed on a pin 49 which in the longitudinal direction is mounted slidably in a direction parallel to the axis of the bottom making cylinder and slides with its front end, which is preferably arched, under spring action along a cam disk 50 the sliding surface of which is situated vertically to the axis of the bottom making cylinder 6, thus any changes in the cam disk will result in a reciprocating motion of pin 49, lever 45, 46, lever 41, 42, and also finger 18 in a direction parallel to the axis of the bottom making cylinder 6.

Pivots and fulcrums 4 7 of the pin 49 which are preferably arranged on each side of lever 45, 46, are mounted on each of the four equally spaced arms 51 of a holder .52 which rotates along with the bottom making cylinder 6 to provide the four operating stations of this machine. (The FIGURE machine has five such stations.) One holder 52 each having four fingers 18 moving in three dimensions is located on each side of the bottom making cylinder 6 on the surface of which the workpieces are supported during the formation of the bag bottom, thus the lateral fingers 18 are manipulated to operate on the workpiece from both sides as shown in FIGS. 2 to 7.

After the leading tube end, held at the lower tube wall by the middle grab 8, and the side folds 118 and 119 (FIG. 2) are opened in the range of the future bottom by opening roll 20 (FIG. 1) in cooperation with the lateral grabs 9 (FIG 1, 2 and 3), and the corner wrappers 121 and 122 of the bottom are folded down by tools and 21 (FIG. 1), the fingers 18 controlled by the cam disks place themselves behind the future folding line 125 of the trailing lateral wrapper 126 on both sides of the bottom making cylinder 6 but still on the tube section, leaving the side wrapper free. Subsequently the bottom paste 127 shown by hatched lines will be applied by a known, revolving paste member 23 (FIG. 1.)

Then follows the folding of the advancing side wrapper 129 (FIG. 3) along the folding line 130 (FIG. 4) by the folding clamp 24 by means of a known rotary folding knife 25 (FIGS. 1 and 3). The middle grab 8 and the lateral grabs 9 have been withdrawn from the workpiece (FIG. 3) prior to the operation of clamp 24 and knife 25 in a known manner inorder to release, on the one hand, the advancing side wrapper 129 and, on the other hand,

to clear the way for the folding knife 25. From the release of the workpiece by the middle grab 3 and the lateral grabs 9 until after the folding-in of the same into the folding clamp 24 the workpiece is held in position, according to the invention, by the lateral fingers 13.

After the workpiece has been tightly held in the folding clamp 24-, the lateral fingers 18 (FIG. 4) controlled by the cam disks slide further onto the bag and get underneath the slightly raised, trailing side wrapper 126 as a result of the curvature of the bottom making cylinder. Meanwhile the future folding line of the trailing lateral wrapper has, due to the continuous traveling of the workpiece along with the respective grabbing device of the bottom making cylinder, come under the edge of a rotating tool 26 (FIGS. 1 and 5) which according to the invention is provided in a fixed position opposite the bottom making cylinder. The edge of tool 26 advancing at the same speed as the workpiece defines the folding line 125 of the trailing side wrapper 126 which will be raised at the edge of tool 26 by the fingers 18 which are lifted at this moment and are advanced in the direction of travel. Thus the folding line 125 is given its proper and final position.

As the tool 26 proceeds, probably at a slightly accelerated speed, said tool is raised from the workpiece; then the fingers 18 will move forward some distance and be lowered down to the workpiece (FIG. 6). Thereby the following side wrapper 126 will be completely turned round the folding line 125 and folded down to its final position. Meanwhile the workpiece has come under the known, stationary tool 27 (FIGS. 1 and 6) designed to turn over and hold down the advancing side wrapper 129, so that this side wrapper will be turned over and held down until it is passed to another cylinder 2Q leading to the delivery. First the workpiece will still be held by the folding clamp 24 in the known manner, thus at the same time the lateral fingers 18 are allowed to slightly withdraw (FIG. 7). Shortly before the workpieces are conveyed to the bypass cylinder 29, the folding clamp 24 opens, while the workpiece is held at the bottom making cylinder 6 by the fingers 18 until it is finally received by the grab 28 of the bypass cylinder 29, said fingers 18 lifting off the workpiece only at the last moment and then retiring. The lateral fingers 18 will then be returned to their initial positions during the remaining circulation of the bottom making cylinder.

The control of the fingers 18 as referred to above will now be completed, according to the invention,-in such a manner that the fingers 18 also form the fold required when forming the bottom square, thus replacing the aforementioned preliminary fold. To explain the folding procedures reference is made to FIG. 8.

In the case of the known bags, the lower tube wall shows at the bottom center the transverse preliminary fold 131 which at this place is superfluous and was made in a transverse folding station ahead of the bottom making cylinder into the completely straight tube sections through the two tube walls simultaneously with the transverse preliminary fold 132 in the upper tube wall. In the known art, however, only the transverse preliminary fold 132, in the upper tube wall 133 is necessary in order to properly fold back the part 134 of the upper tube wall 133 when subsequently mounting the advancing tube end to form the bottom square. The completely folded bottom, situated between the edges 125 and 138, as accomplished by subsequently turning over the bottom side wrappers 125 and 129, will remain in the position shown in FIG. 8, folded on the top tube wall, until the bag is filled. Thus the lower tube wall 130 of the bag ready for shipment will be visible over its entire length and clearly show the transverse preliminary fold 131 disturbing any imprint.

Mostly both tube walls show other transverse preliminary folds 139 and 140 which are unnecessary in the tube walls, but are produced in the mounted bottom square when prefolding the fold for the bottom edge 125 and spams? were so far inevitable in the conventional production where the transverse preliminary fold is formed in all superjacent paper layers. The present invention provides that the transverse preliminary folds 139 and 141) are eliminated.

Prior to turning over the trailing lateral wrapper 1.26, as referred to above, the invention provides that the bottom square will be formed as follows: The tube section fed in the manner referred to and held on the bottom making cylinder 6 will be conveyed by the latter to the bottom opening cylinder 13 known in itself. Here the upper tube wall will again be lifted by one of the suckers 14 in order that in the further procedure the stationary so-called bottom laying nose 15 (see a.so FIG. 9) is permitted to enter the opened tube end and to fold back the upper tube Wall of the tube end to form the bottom square and to fold it back gradually. To open the side folds, a pair of lateral grabs 16 at the bottom opening cylinder 13 has previously seized the top of the side folds in cooperation with one of the pairs of suckers 17, stretching the side folds in the known manner when traveling forward.

According to the invention a pair of tools 18 provided at the bottom making cylinder and actuated in a manner similar to the lateral grabs is placed largely on the tube section with its beveled front edge 19 along the line 132 where the upper tube wall and the upper side fold members are to be folded when forming the bottom square. The bottom opening cylinder 13 is provided with recesses 2i) for this purpose. Under the action of the bottom laying nose 15 the bottom square will be formed in cooperation with the fingers 18 against the beveled edge 19 of -whioh the folding will be effected satisfactorily without needing the preliminary fold 131 (FIG. 8).

' draw from the tube section, permitting the bottom square to be flattened completely. After forming the bottom square the lateral fingers 18 are placed upon the tube section behind the future folding line 125 of the succeeding side wrapper 126 whereupon the trailing side wrapper 126 is folded in the manner referred to above.

The means as described above are used to control the fingers 13. The cam disks d4, 48, and 5t? need simply be given a respectively completed shape of curvature.

Thus, by a simple design of the control the mechanism used for turning over the succeeding side wrapper 126 and eliminating the preliminary fold 139, 146 (FIG. 8) will also be utilized for forming the bottom square without requiring a preliminary folding. One thereby obtains bags, the front of which shows no ugly folding lines, and the imprint on these sides of the bag will be fully appreciated.

To accomplish the invention the fingers, together with the other tools situated laterally of the bottom making cylinder, will be mounted on a carrier permitting the tools to be adjusted to a different width of bag for all operating stations. A device answering this purpose is shown in FIGS. l0, l1, and 12 for a bottom making cylinder which,

'unlike FIG. 1, is provided with five-instead of fouroperating stations. The working cylinder Zill is driven in the direction of arrow 292 (FIG. by means of gear 293 (FIG. 11) through a shaft 2&4 mounted in a flanged bearing 20s of the side frame 26 5 of the machine. The shaft 264 extends only to the working cylinder 261 and is bolted in a manner (not shown) to said working cylinder. On the other side the Working cylinder 261 is mounted in a manner (not shown) on a shoulder of the flanged hearing 29% fixed in the other side frame 2437 of the machine, for example, by means of ball bearings.

The right-hand and left-hand grabs 299 (FIGS. 10, 11, and 12) situated forwardly, with respect to the direction of rotation of the working cylinder (arrow 202), are supported in a known manner by means of respective levers at the arms of two carriers located on either side of the working cylinder, e.g., five-armed disks 21%; the grabs 209 may thus be considered as leading grabs. The righthand and left-hand lateral grabs 211 situated rearwardly, also as seen with respect to the direction of rotation of the working cylinder are mounted on another two fivearmed disks 212 together with the groups of levers referred to above; the grabs 211 may thus be considered as the trailing grabs. Thus, corresponding to the five arms of disks 211 and 212, there are five pairs of leading and trailing grabs 2d? and 211 which constitute five operating stations at the working cylinder together with essentially one middle grab 213 each and one folding clamp 214 each.

To elucidate the drawings, FIG. 10* shows only the lateral grabs of a single working field; FIG. 11 shows, at the top of the cylinder, a pair of leading side grabs 209 and, at the bottom of the cylinder, a pair of trailing side grabs 211, FIGURE ll also including the bearings and control of the levers. Central grabs and folding clamps are shown only in FIG. 11.

The five-armed disks 210 carrying the leading side grabs 209 are rotatable yet not displaceable in its axial direction by means of ball bearings 215 on a bush 216, each movably arranged on the flanged bearings 2% and 203. The disks 210 are driven from the working cylinder 201 with which they must rotate in common, by means of a pin 2,17 and 2.18, respectively. One pin 217, 218, each is screwed up in the right-hand and left-hand disk 210, respectively, and extends in a manner (not shown) through holes in the webs of the working cylinder so as to be caught by the rotation of the working cylinder, thus also entraining the disks 21%). At the same time, however, the pins 217, 218, can be shifted in the working cylinder in axial direction. The five-armed disks 212 carrying the trailing side grabs 211 are, in turn, rotatable on the hub of one of the disks 21% and secured against displacement in axial direction and for adjustment in the direction of rotation they are screwed on the disks 216 by means of one screw 219 each through a slot 220 (FIG. 10). Thus the adjustment of the rear grabs in relation to the front grabs can be effected in peripheral direction as required by the particular size of bag.

Screwed up to a flange of each of the bushes 216 is also right-hand or left-hand cam holding disk 221 to which each of the cam members 222 to 226 are fixed to control the grab movements. Unlike the disks 21d and 212 rotating in common with the working cylinder and carrying the side grabs see and 211, the cam holding disks 221 are nonrotatable. For this purpose they have one pin 2 27 each which slidably extends through one hole each in the two machine frames 2% and 207, these pins allowing the disks 221 to be shifted in longitudinal direction.

In order to adjust the lateral grabs 2&9 and 2 11 held by the disks 2 1i and 212 commonly to the width of the bag, i.e., to move the disks closer together or further apart in axial direction, the bushes 216 carrying the disks 216 and 2-12 are provided with one female thread 228 each which is engaged by a male thread 229 on the hub of one gear 239 each pivoted on the flanged bearings 206 and 2418. The gears 236 are situated on one side, abutting a collar 231 of each of the flanged bearings 206 and 208, and will be forced against the collars 231 by three tension springs 232 (FIGS. 10 and 11) stretched between the cam holding disks 221 and the machine frames 2% and 267. By turning the gears 23% in one or the other direction the bushes 216 as well as the disks 21%, 212., and 221, and thus also the lateral grabs 299 and 211 together with the stationary controlling cams 222 to 226, will be adjusted on the surface of the cylinder.

A uniform adjustment in the same direction of the side grabs and their cams on both sides of the cylinder will be obtained by a common drive of both gears 23%) via intermediate gears 233 and driving gears 234, the latter being mounted on a driving shaft 23s in a torsion-proof manner,

said shaft being furnished with a hand wheel 235 to carry out the adjustment. The thread in the bushes 216 and on the gears 23% is right-handed on one side and lefthanded on the other side to obtain an opposed displacement when the gears 230 turn in equal direction.

The invention further provides the working cylinder shell with notches 237 (FIGS. 11 and 12) into which the holders 238 and supports 239 of the leading lateral grabs 209 may enter during adjustment. The grabs 299 proper which are given an angular shape and bear against one rim 240 of the notches 237 may therefore be of a short and sturdy design and of little resilience.

In the case of the trailing grabs 211 for which the conventional shape is retained owing to their additional movements in peripheral direction it will be seen from FIG. 11 (bottom) which length the trailing grabs 211 must be given in contrast to the leading grabs 209 in order to extend from their holders 241 which can only be moved up to the cylinder to the remotest position on the cylinder,

bottom making cylinder of a cross or block bottom bag making machine can be adjusted commonly and simul taneously to the bag widths to be produced. Thereby a considerable saving in time and an increase in production will be attained when resetting the machine.

I claim:

1. In a machine for making bags from tube sections of paper orthe like, a bottom making cylinder, grab means by which the leading edge of each tube section is held to be fed in the longitudinal direction around the periphery of said cylinder, primary tools adapted to form and flatten the leading end of the tube section to form a bottom square, secondary tools at each side of the bottom making cylinder, said secondary tools including side grabs and lateral fingers rotating along with said bottom making cylinder, said lateral fingers comprising a finger on each side of said bottom making cylinder, and operating means co-acting with said fingers for selectively moving the same in the direction of the radius, the axis and the periphery of said bottom making cylinder to push said fingers, in the direction of their own length, under the trailing side wrapper and move said fingers forward, in the direction of travel of the periphery of said bottom making cylinder, in relation to the tube section as the latter is being carried forward, therby folding the trailing side Wrapper forward, whereby the tube section is manipulated to be formed into a bag.

2. The machine as claimed in claim 1, in which each finger is a fingered first lever mounted on a first pivot axis which is parallel to the axis of said bottom making cylinder, said first pivot axis being carried by a second lever mounted on a second pivot axis that can be shifted axially, and in which said operating means include a cam for moving said second pivot axis of said second lever in the axial direction of the bottom making cylinder.

3. The machine as claimed in claim 2, including also a folding clamp and a cooperating folding knife, cam disks of a shape to operate said clamp to hold the tube section against the bottom making cylinder prior to turning over the trailing side wrapper, the lateral fingers being operative to hold the tube section until the tube section is received by said folding clamp and subsequent to the folding of the side wrapper until the delivery of the formed bag from the cylinder.

4. The machine as claimed in claim 3, including a tool rotating opposite the bottom making cylinder, said tool having an edge cooperating with said fingers to define the 7 fold of the trailing side wrapper.

5. The machine as claimed in claim 4, including a drive forthe rotating tool, said drive lifting the edge in an 6. In a machine for making bags, at bottom making cylinder by which a tube section of paper or the like is fed in longitudinal direction, tool fingers on either side of the bottom making cylinder, said fingers rotating along with the bottom making cylinder, control members causing the tool fingers to rest on the tube section, while the same lies on the peripheral surface of the bottom making cylinder, along the line limiting the folding back of the upper tube wall prior to forming the front tube end to form the bottom square, whereby the fingers, during the forming of the bottom, define the fold in the upper tube wall along this line, operating means for selectively moving said lingers in the direction of the radius, the axis and the periphery of said bottom making cylinder for subsequently causing said fingers to turn the trailing side wrapper forward, and tools for forming the bottom square.

7. The machine as claimed in claim 6, including a bottom opening cylinder provided with recesses on its peripheral surface, said recesses being positioned to permit the fingers to enter between the bottom opening cylinder and the bottom making cylinder.

8. In a machine for making bags, the combination which comprises:

(a) a rotatable bottom making cylinder for feeding tube sections of paper or the like in longitudinal direction, said cylinder being mounted on an axial drive shaft;

(b) non-rotatable bearing means arranged near said cylinder;

(c) first holding means mounted on said rotation relative thereto;

((1) primary and secondary tools carried by said first holding means and being rotatable together with said cylinder;

(e) second holding means non-rotatably said bearing means;

(f) control means carried by said seconti holding means, said control means cooperating with said tools; and

(8) means operatively associated with said hearing means for moving the same, together with said first holding means and the tools carried thereby as well as with said second holding means and the control means carried thereby, in axial direction relative to said cylinder.

9. A machine as claimed in claim 8, in which said rotating carrying holders engage web-like spokes of the cylinder by means of pins which are mounted on the carrying holders, and said web-like spokes are provided with holes in which said last-mentioned pins engage, whereby said carrying disks will be forced to rotate with said working cylinder but will be axially adjustable therewith.

10. The combination defined in claim 8 wherein said drive shaft is mounted on a machine frame, and wherein said bearing means include a bushing which is arranged coaxially with said cylinder and is axially movable relative thereto.

11. The combination defined in claim 10 wherein said moving means comprise a hub member which is coaxial with said cylinder but is axially immovable relative to said cylinder, a first thread on said hub member, and a second thread on said bushing, said threads being in engagement with each other so that upon rotation of said hub member said bushing is moved axially with respect to said cylinder.

12. The combination defined in claim 11 wherein said non-rotatable bearing means comprise two threaded bushings arranged on opposite sides of said cylinder, respectively; wherein said first holding means comprise two holders arranged on said two bearing means, respectively; wherein there are two sets of primary and secondary tools carried by said two holders, respectively; wherein said second holding means comprise two disks arranged on said two bearing means, respectively; wherein there are two sets of control means carried by said two disks, respecbearing for mounted on tively; wherein said moving means move each of said hearing means, together with its respective holder, primary and secondary tools, disk, and control means, in axial direction relative to said cylinder; and wherein said moving means comprise two hub members whose threads are in engagement with the threads of said two threaded bushings, respectively, the threaded engagement between one hub member and bushing being that of a right-hand thread and the threaded engagement between the other hub member and bushing being that of a left-hand thread, said moving means further comprising drive means for rotating both of said hub members in the same direction.

13. A machine as claimed in claim 11, and in which tension springs stretched between the non-rotating carrying disks and the machine frame force said bushing and hub member axially away from said bottom making cylinder, and stop shoulders on said drive shaft to locate said hub member.

References Cited in the file of this patent UNITED STATES PATENTS Stilwell Apr. 15, 1913 Beckman Jan, 17, 1933 

1. IN A MACHINE FOR MAKING BAGS FROM TUBE SECTIONS OF PAPER OR THE LIKE, A BOTTOM MAKING CYLINDER, GRAB MEANS BY WHICH THE LEADING EDGE OF EACH TUBE SECTION IS HELD TO BE FED IN THE LONGITUDINAL DIRECTION AROUND THE PERIPHERY OF SAID CYLINDER, PRIMARY TOOLS ADAPTED TO FORM AND FLATTEN THE LEADING END OF THE TUBE SECTION TO FORM A BOTTOM SQUARE, SECONDARY TOOLS AT EACH SIDE OF THE BOTTOM MAKING CYLINDER, SAID SECONDARY TOOLS INCLUDING SIDE GRABS AND LATERAL FINGERS ROTATING ALONG WITH SAID BOTTOM MAKING CYLINDER, SAID LATERAL FINGERS COMPRISING A FINGER ON EACH SIDE OF SAID BOTTOM MAKING CYLINDER, AND OPERATING MEANS CO-ACTING WITH SAID FINGERS FOR SELECTIVELY MOVING THE SAME IN THE DIRECTION OF THE RADIUS, THE AXIS AND THE PERIPHERY OF SAID BOTTOM MAKING CYLINDER TO PUSH SAID FINGERS, IN THE DIRECTION OF THEIR OWN LENGTH, UNDER THE TRAILING SIDE WRAPPER AND MOVE SAID FINGERS FORWARD, IN THE DIRECTION OF TRAVEL OF THE PERIPHERY OF SAID BOTTOM MAKING CYLINDER, IN RELATION TO THE TUBE SECTION AS THE LATTER IS BEING CARRIED FORWARD, THEREBY FOLDING THE TRAILING SIDE WRAPPER FORWARD, WHEREBY THE TUBE SECTION IS MANIPULATED TO BE FORMED INTO A BAG. 